Fischer-Tropsch synthesis iron-based catalyst, preparation method and application thereof

Abstract

The invention discloses a Fischer-Tropsch synthesis iron-based catalyst, which includes Fe, a reduction assistant, an electronic assistant and a hydrogenation assistant. The reduction assistant is one or more of the following elements: Cu, Zn, Mn, Mg and Zr. The electronic assistant is one of the following elements: Na, K and Rb. The hydrogenation assistant is one of the following elements: Ru, Rh, Pd and Pt. All the components exist in the form of oxides. The Fe atom accounts for 10wt%-80wt% in the catalyst. The catalyst comprises Fe, Cu, Zn, Mn, Mg, Zr, the electronic assistant and the hydrogenation assistant in an atomic ratio of 200:0-50:0-200:0-200:0-200:0-200:0.5-30:0-10. The iron-based catalyst provided by the invention has high catalytic activity, good stability, low inactivation rate, high selectivity on low carbon olefin (C2-4=), C2-4 hydrocarbon selectivity over 70%, and olefin selectivity up to over 90%. The raw materials are cheap and easily available, and the preparation cost of the catalyst is reduced.

Description

technical field [0001] The invention relates to an iron-based catalyst and its preparation method and application, in particular to a Fischer-Tropsch synthesis iron-based catalyst and its preparation method and application. Background technique [0002] Fischer-Tropsch synthesis was invented in Germany in the 1920s and gradually turned to industrial applications. It is a method of producing chain hydrocarbons from the synthesis gas of carbon monoxide and hydrogen. The synthesis gas comes from coal, natural gas, coal bed methane and other carbonaceous biomass. The products of Fischer-Tropsch synthesis are divided into low-carbon gaseous hydrocarbons (C 1-4 ), medium carbon liquid oil (gasoline and diesel, C 5-22 ) and high carbon solid paraffin (C 20+ ). Fischer-Tropsch synthesis catalysts generally include the following three types of components: main metal, support or structural aids, other various aids and additives. The main active metals of Fischer-Tropsch synthesis...

AI Technical Summary

Problems solved by technology

The main active metals of Fischer-Tropsch synthesis catalysts are metals of group VIII, among which only four metals, Fe, Co, Ni and Ru, have sufficiently high Fischer-Tropsch activity. Ru is the metal with the highest catalytic activity in CO hydrogenation reaction, especially for high The selectivity of straight-chain alkanes with molecular weight is very high, but their large-scale industrial application is limited due to their low natural reserves and high price.

The hydrogenation activity of Ni is second only to Ru, but it has two main disadvantages: one is that the strong hydrogenation ability makes the CH in the Fischer-Tropsch synthesis product of Ni catalyst 4 The selectivity of Ni is too high; the second is that Ni is easy to generate volatile metal carbonyl compounds under the conditions of industrial Fischer-Tropsch synthesis, which leads to the continuous loss of metals

Images